You are standing on a train station platform as a train goes by close to you. As the train approaches, you hear the whistle sound at a freq?

uency of f2 = 75 Hz. Take the speed of sound in air to be v = 340 m/s. Find an equation for the speed of the sound source, in this case the train

Answer 1

You have two unknowns here. The frequency of the whistle at zero velocity, and the speed of the train.
As it is approaching you then f2 = f1* 340/(340 – v1)

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